I directly exported stems from maschine and they are very distorted on LP16s headphone jack. I padded them down on output to almost nothing to get the distortion to stop.
What levels does LP16 want to see? It took -30db for me!
And the onboard mixer in uTool2 doesn’t seem to do anything?
The if the source files are good in this case cannot overload the device. I would suggest you to check the device with the store where you bought your device